Screening will occur from Day -28 to Day -2. Subjects will check-in to the clinic on Day -1 and receive a single oral dose of 150 mg AT1001 on Day 1. Subjects will be discharged from the clinic on Day 2 (if stable as determined by the Investigator) and return for daily visits on Day 3 through Day 6 for a safety assessment and PK sampling. Subjects will undergo a follow-up visit on Day 7 (+1) and an end of study visit on Day 10 (+1).